Same for me, we 'travel' our paintings during one year to communicate to the various countries and exhibitions, but it is the same for masters also...
But I agree with Brian, the painters of 230 mm flats are not many in Germany, France, Belgium, Netherlands, Sweden. I don't know about Italy or Spain. During the past year 50% of my paintings are 30mm, but many painters prefer today the larger sizes, proably more visible and convenient to paint.
Also in competition, one 30mm flat has little chance of being detected, unless a mounted olifant....
I have four English knights Under preparation and many queuing .. Fortunately, we have Eric to keep us awake!!